Cylewet 12Pcs Trimmer Variable Capacitance Ceramic 6mm Capacitor Kit 5PF 10PF 20PF 30PF 40PF 60PF for Arduino (Pack of 12) CYT1018

Worked as intended. Fine adjustment was possible.

Good product.

Arrive on time as scheduled. It even came with and adjustable mini screw driver. Nice.

I tuned several crystals with these from 32kHz watch crystals to 20Mhz microcontroller and had great luck. Swap out if needed, I start in middle and go up or down in value/range depending on how it responds and how many I've got. They hold the setting very well, even with vibration. I'll be buying more!

Not accurate

Not bad at all but the 2-week wait is stretching it a bit.

I purchased these trimmer capacitors for an antenna-mounted preamp project in amateur radio. I just needed two 40pF units. Other reviews implied that the units did not seem to "do anything". I attached an LCR meter to the leads of the 40 pF trimmers and measured their capacitance as I adjusted them (using the supplied tiny screwdriver). Their capacitance did adjust, but I noted several things: 1. The range is a bit limited for the 40 pF units; it went from 12 - 40 pF 2. You will go through the entire range is about 1 full turn. That is quick! Yet the units are multiturn. That means the trimmer will cycle through multiple iteration of the entire range. You will need to slow down to make any meaningful adjustment. In summary, I would buy these again for certain applications where low cost is a major consideration and a precise value is not required (just a "get' er done" adjustment will suffice).

The plastic housing is a bit flimsy and I was not sure the cap was functioning properly.

Not greatest quality but OK. Trimmer Caps are always a pain in the butt to work with. Good as any for the price.